WordPress isn’t showing up as valid xhtml…

Hey everyone. Need some help here…

I’ve just installed WordPress 2.0 with that “phpMailer” plug-in as I don’t have an SMTP server. With that being said, I seem to be having some validation errors with which I have no part in… From what I understand at least…

My errors involve the following found here: https://validator.w3.org/check?uri=http%3A%2F%2Fsapphire.indstate.edu%2F~cburk1%2Findex.php

Since I didn’t even touch the xhtml, what could be causing this? Please help!

Thanks